Lock for switches.



G. WUELSER.

LOOK FOR swn'tmns. APPLICATION FILED JULY 26, 1910 Patented Nov.15,1910.

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G. WUELSBR. LOOK FOR SWITCHES.

APPLICATION FILED JULY 26, 1910 Q 975 91 Patented N0v.15, 1910.

v T zsnnms-snpnim J2 J l? the 011 as disclosed in my prior ments 10 and11.

and

lock, Fig. 4 is a plan of 'mg' revolubly mounted upon the former.

a, or txnnsmea'on, rnnnsrtvanm.

LOCK ron swrrcnns.

specification of Letters Patent Patented Nov,

975,918. Application filed July 26, 1910 Serial No. 573,859. I

To all whom it may cone-em: Be it known that I, GOTTLIEB Wunrsnn acitizen of the United States of America, residing at New Kensington, inthe countyof' estmoreland and State .of Pennsylvania, have inventedcertain new and useful Im-' provements in Looks for Switches of whichowing is .a' specification, re erence be-. ing hadtherein to theaccompanying draw mg. p g This invention relates to locks for switches,is an improvement in connection with the lock disclosed in my pendingapplication filed June 18, 1910, Serial No. 567,624.

Besides having the. same objects in view application, the presentinvention-aims to simplify the construction, provide parts that can beeasily manufactured and assembled, and to provide a lock that ispositive in its operation and free from injury by ordinary use.

Reference will now'be had to the accompanying drawings, which illustratethe best form embodying my invention, the said invention being fullydisclosed in the following description and claims.

the drawings :-Fi ure 1 is a plan of the lock, Fig. 2 is' a sic leelevation of the same, Fig. 3 is a cross sectional view of the adetached upper locking member, Fig. 5 is a side elevation'of the same,Fig. 6 is a plan of a detached lower locking member, Fig. 7 is a sideelevation of the same, and Fig. 8 is a perspective view of a detachedbinding post adapted to form part of the lock.

lock in accordance with this'invention comprises a stepped cylindricalmetallic casing 1 having the lower edges thereof provided with aperipheral flange 2, which is screwed or otherwise connected, as at, 3to a base plate 4. The casing 1 has the top 5 thereof provided'withacentral opening 6, and secured by screws or other fastening means 7 tothein'ner side of the annular shoulder 8 of said casing. is a horizontalpartition 9 dividing the casing 1 into compartfor the u per lockin tralbeariiig surface is 16- having the u serrated, as at 1 member and thiscenprov ded with a post per end thereof toothed or and reduced andthreaded, disk 12 has the periphery or notched, as at 19 and is providedwith a circumferentiall arranged slot 20- having the ends thereof closedin proximity to each other,'with the intermediate portion of said slotin communication with the outer edges of the disk by an open slot 21.The outer walls of the slot 20 are scallo ed or notched, as at 22similar to the perip ery'of the disk 12.

The upper locking member is similar to the lower lockin member, with theexception that the dis 23 has a central vertical opening 24 providingclearance for the 0st 16 of the lower locking member, thedis 23 alsohaving a central toothed or serrated collar 25 extending upwardlythrough the opening 6 of the casing 1. The disks l2 and 23 are of thesame diameter and with these disks assembled in the compartment 10, theslots 20 and 21 of the disk 12 are normally in vertical alinement withthe slots 26 and 27 of the disk 23.

Mounted upon the toothed or serrated collar 25 of the upper locking membsleeve being clamped upon the collar by a set screw 30 mounted in lugs31, carried by the split ends of the sleeve.

Mounted upon the toothed or serrated portion 17 of the post 16 is asplit sleeve 32,

said sleeve being clamped thereon by a set screw 33 mounted in lugs 34,carried by the split ends of the sleeve. The sleeve 32 is provided withan angularly disposed indicator 35 of a greater length than theindicator 29 and adapted to swing over said indicator.

Screwed upon the reduced and threaded end of the post 16 is a knurlednut 36 which positively retains the sleeves 28, 32 and the lockingmembers in an assembled position.

he top of the casing 1 is graduated similar to a clock, the indicator 29corresponding to an hour hand and the indicator 35 corresponding to aminute hand.

Mounted in the partition 9 adjacent to the openin 14 thereof is theshank 37 of a bifurcated fiinding post 38, said binding post beingretained upon the partition by nuts 39 screwed upon the lower end of theshank 37,

Revolubly mounted in the compartment 10 of the casing 1 is a lowerlocking member and an upper locking member, the latter be- The lowerlocking member comprises a disk 12 having a central depending pin 13extending into an opening 14 provided therefor in the partition 9. Theupper surface of er is a split v sleeve 28 havlng an indicator 29, saidsplit the disk 12 has a central bearingsurface 15 i or conductor 40 inengagement w t retain wire or cond these nuts also retaining the ends ofa wire h the shank 37.-

Mounted up the cas' 1 is a bifurcated binding post 41 having threadedshank 42 thereof extending through the shoulder 8 and the edge of theartition 9, said binding post being in position by nuts 43 screw uponthe shank 42, said nuts retaining a uctor 44 in engagement with theshank. The bifurcation or openin 45 of the binding post 41longitudinally a ines with an o ening 46 formed in'the casing 1 and witht e binding post 38.

I Movably mounted the binding posts 38 and 41 is a switch. arm or blade47 having the outer end thereof provided with a handle The arm 47 isrectangular in cross section and has the inner end thereof reduced andcylindrical, as at 49 to enter the binding post 38. The arm 47 adjacentto the reduced end thereof is provided with a vertical cylindrical pin50 extending upwardly through the slots 20 and 26 of'the locking disks12 and 23 res tively. To insure a contact between the inding post 41 andthe arm 47, the up 1' edges of the binding post 41 are provi ed withapertured lugs 51 adapted to be connected and drawn together by a setscrew 52.

The pin 50 extending upwardly through t e i the slots 20 and 26 isadapted to retain switch arm 47 in engagement with the bindmg posts 38and 41 and complete an electrical circuit. To shift the arm 47 to breakthe electrical circuit, it is necessary that the locking members beshifted whereby the slots 21 and 27 of the disks 12 and 23 res ctivelywill vertically aline and provide pin 50, the outward movement of saidpin being limited b the casing 1, which preventsthe switc arm 47 frombecoming accidentally disengaged from the casing, but allows the reducedcylindrical end of the armto moved out of en agement with the bindingpost 38. To shift the locking disks 12 and 23 to release the pin 50, itis necessary that the operator of the lock be familiar with thecombination, otherwise considerable difiiculty and time consumed inarriving at t e proper combination to release the pin 50.

.After-the arm 47 has been shifted outwardly and the circuit broken, thelocking disks 12 and 23 can be shifted to revent the arm 47 from beingrestored to its normal position, consequently a machine equipped withthe lock could not be started except by the authorized operator. Byproviding t e outer edges of the disks 12 and 23 and the outer sides ofthe slots 20 and 26 with notches, a person tampering with'the lock orattempting to openthe will be deceived and on the annular shoulder 8 bfmaintaining teriorly will be ex eri'enced the outer bindingpost tendinto said casing and engage the innermisled, believing that the lockcntains tumblers on account of the noise 1produced by the pin 50 ridingover the sea oped or note ed edges of the locking The lock has beendesigned whereby one or more switch arms or blades 47 can be used inconnection with the lock, as shown in 1 of the drawings, one set of thecombmations releasin oneof the arms and another set of comb thus thatthe lock .can be used for controlling the opening and closing of one ormore circuits.

The switch arm 47 can be made of malleable metal, wherebythe end 48 canbe bent upwardly after the arm'has been placed in the casing 1, or thepin 50 can be attached to the arm after said arm has been inserted inthe opening 46 and prior to connect ng the partition 9 to the casing.Suitable insulation can be used where necessary tor separate anddistinct circuits in connection with the switch lock.

'From the foregoing it is apparent that I have devised a novel lock forswitches embodying superimposed locking disks for retainin a contactarm' in an adjusted position, t he arm being arranged whereb it willnormally contact with an outer bin ing post and can be easil shiftedinto engagement with an inner binding post, thus completing the circuitbetween i e posts.

What I claim is 1. In a lock for switches, a base plate, a casingcarried by said plate, a horizontal partition mounted in said casing anddividing said compartment, slotted locking disks rotatablv mounted inthe upper compartment of said casing,ibinding posts connected to saidpartition with one of the binding posts exof said casing, a locking armmovably mo 'nted in the upper compartment of said casing and normally inen agement with the outer binding post and a apted to engage the innerbinding post, a pin carrie by said arm and extending upwardly throughsaid slotted disks, and means on top of said casing for rotatingsaiddisks to release the pin of said arm.

2. In a lock for switches, a plate, a casing mounted upon said plate, apartition arranged in said casing, a binding post carried by saidpartition, a binding post car-' ried by the outer side of said casing, aswitch arm normally in Engagement with binding post, and rotatablelocking disks arranged within said casing andadapted to lock said arm inengagement with said binding post. 3.. A lock for switches, comprising acasing, a switch arm extending into said casnations another arm. It iseasing into an upper and lower adapted to ex- 7 casing and ing, a pincarried by said arm within said normally retaining said arm in saidcasing, locking disks revolubl mounted in said casing for engaging saidpin and fixing said arm relatively to said casing, and means arrangedupon said casing for adjusting said disksto release said pin.

.4. A. lock for switches, comprisin a casing, a binding post arrangedexterlorly of sad casing, said casing, a switch arm normally held inengagement with the exterior binding post and adapted to extend intosaid casing and engage the interior binding post, a pin carried by saidswitch arm for normally retaining said arm within said casing, slottedsuperimposed locking disks adapted to engage said pin and hold the armthereof in ena binding postarranged within ga ement'with the interiorbinding post,

and means arranged upon said casing for 20 rotating said disks, saidmeans including sleeves and indicators carried thereby.

5. In a permutation lock for switches, the combination with a switch armadapted to complete a circuit, of a pin carried by said arm for limitingthe movement thereof, superimposed locking disks adapted to engage saidpin for locking said arm, and means for shiftlng said disks.

In testimony whereof I aflix my signature 30 in the presence of twowitnesses.

GOTTLIEB WUELSER.

' Witnesses:

THEODOR 'ZUND, KARL KoTToRs.

